As soon as the Hero arrives at the cave they will notice three Will-o-the-Wisps at the entrance of the cave. This explains the mystical light they talked about. After dealing with them head into the cave.

After finding the body of Eduard Denile, clear the rest of the cave of trolls (this includes the sub-level of the caves). Return to the village Harlun's Watch and speak to Drarana Thelis, then report to Burz to complete the quest.

Burz gro-Khash has given me a contract to go to Harlun's Watch, near Cheydinhal, and investigate the disappearances of some of the local populace. I should speak to Drarana Thelis.

Update: After speaking with Drarana Thelis:

I have spoken to Drarana Thelis in Harlun's Watch. She tells me that folks have been seeing strange lights in the swamps, and when they've gone to investigate, none have returned.

Update: Once the source of the lights as will-o-wisps has been located:

It seems that the strange lights people were seeing over the swamp are will-o-the-wisps. But, there don't seem to be any signs of the townsfolk who disappeared. The Will-o-the-wisps were surrounding a cave, though. I should investigate.

Update: If the Hero kills all of the trolls before finding the bodies:

I've killed all of the trolls in Swampy Cave. I should look for evidence that these were the creatures responsible for the disappearances at Harlun's Watch.

Update: Once the corpses have been found:

Inside the Swampy Cave, I've found the corpses of the townsfolk that are missing. It looks like trolls have been feeding on the people weakened by the will-o-the-wisps. I should report this to Drarana Thelis.

Update: If the Hero finds the bodies before finishing off all the trolls:

Inside the Swampy Cave, I've found the corpses of the townsfolk that are missing. It looks like trolls have been feeding on the people weakened by the will-o-the-wisps. I should make sure to clear out all the remaining trolls from the cave complex.

Update:After killing all the trolls:

I've killed all of the trolls in Swampy Cave. I should report what I've found to Drarana Thelis.

Update: After reporting back to Thelis:

Drarana Thelis was saddened at the fates of the townsfolk, but has rewarded me for my efforts. I should report to Burz gro-Khash for payment of the contract.

Update: After reporting back to Burz:

Burz gro-Khash has paid me the balance of the contract. He tells me that he has no further contracts to offer.

Quest complete

Update: If The Stone of St. Alessia hasn't been completed:

Burz gro-Khash has paid me the balance of the contract. He tells me that he has no further contracts to offer, but I should speak with Azzan in Sutch, if I have not already.

This section contains bugs related to Mystery at Harlun's Watch. Before adding a bug to this list, consider the following:

Please reload an old save to confirm if the bug is still happening.

If the bug is still occurring, please post the bug report with the appropriate system template 360 / XB1 , PS3 / PS4 , PC / MAC , depending on which platform(s) the bug has been encountered on.

Be descriptive when listing the bug and fixes, but avoid having conversations in the description and/or using first-person-anecdotes: such discussions belong on the appropriate forum board.

There is a common bug with this mission. If one have previously cleared out the Swampy Cave, the body of Eduard Denile will not appear at the quest marker, and one will be stuck. One way around this is to go to Chorrol and talk to Modryn Oreyn and continue with the next quests, Information Gathering and Infiltration. However, you will never complete this quest, and you will skip this advancement. So you will eventually complete the Fighters Guild questline without ever obtaining the Champion rank. The other method is applicable on the PC version only, which is by using the console to advance the quest to the next stage (see console commands) Retail Patch 1.1 should fix this bug. You can also use the cheat code "player.placeatme 00034597". That way, Eduard will be placed near you and you will still be able to finish the quest in a reasonably normal way.